To add to this, past the initial elder-knapping, it looks like they drugged the elders to keep them from rebelling/attending court dates. From the article:

>During Rennie North’s first year at Lakeview Terrace, she gained sixty pounds. Parks had switched the Norths’ insurance, for reasons she never explained, and Rennie began seeing new doctors, who prescribed Valium, Prozac, the sedative Temazepam, Oxycodone, and Fentanyl. The doses steadily increased.